Electrical heating device



Oct. 24, 1933. P. HALAsz I ELECTRICAL HEATING DEVICE Filed May 20, 1930 fienforw I Paul Halasz 2.66 AWAKE FCC Patented Oct. 24,193

PATENT OFFICE ELECTRICAL HEATING DEVICE Paul Halasx, Budapest, Hungary Application May 20, 1930, Serial No. 454,123, and in Great Britain January 2, 1930 3 Claims. (01. 219-47) This invention relates to an electrical induction heating device of the kind in which an electric conductor is surrounded by a solid iron body to produce heat by the eddy currents induced in the iron by alternating currents flowing through said conductor.

The invention has for its object to provide a heating device which can be easily manufactured in a great variety of shapes, converts the current. into heat with the highest efllciency and forms a self-contained unit enclosing totally the electric conductors so that such units are adapted for general use in any medium even submerged in electrically conducting liquids.

The device according to this invention consists of a completely closed box formed by two equidistant plane or curved solid iron plates and by' peripheral iron ribs which box contains a ser- 'pentine conductor isolated from the iron and by the equidistant iron plates between the several turns of said serpentine conductors.

The annexed drawing shows two embodiments of this invention as examples.

Figure 1 is a flat heating plate or unit shown in plan view with the cover'plate removed and the insulators in section,

Figure 2 is a sectional side elevation of the same with the cover plate across line 03-2: of Fig. 1,

Figure 3 is the cross-section of the heating plate across line u11 of Fig. 1,

I Figure4isapartofFig.3onanenlarged scale, I 35 Figure 5 is a side elevation of a cylindrical heater partly in section, and

Figure 6 is a cross-section thereof. b is a solid iron bottom plate, and equidistant or parallel therewith is a solid iron top plate 1. joined by a peripherally solid iron rib r to a completely closed box. 0 is a serpentine conductor located within said box. Solid with the bottom plate I) arerribs d of solid iron arranged.

between the several turns of the serpentine conductor c along the straight'parts thereof. In the consecutive parallel conductors the currents flow in inverse directionsso that the magnetic fluxes m are closed to magnetic circuits through the ribs d. the conductor from the surrounding iron. The ribs d are formed preferably by grooves worked into the bottom plate b, while a channel I is milled across the ribs d to receive the heads e of the turns of the serpentine conductor. p is an insulating layer preferably of mica protectsolid iron ribs overbridging the air-gap enclosed l are electric insulators separating ing the heads e uncovered by the insulations l.

The top plate t is bolted or screwed on the bottom plate as shown in Fig. 4, where ,f are the screws set flush with the cover plate. In the per cylinder 1: corresponding to the bottom plate is provided with the ribs d. The outer cylinder at is slid over cylinder 1) and the serpentine conductor c is located in the grooves between the ribs d in the annular space between the two cylinders b and t. The peripheral ribs 1', r are formed by annular flanges of the inner cylinder b. The device shown in Figs. 5 and 6 can be used as a melting pot for tin, lead, aluminum etc. The whole melting pot is insulated against loss of heat by suitable layers of some refractory materialj.

What I claim is:

1. An electric heatingv device comprising a completely closed box of solid iron having a hollow therein and defined by two equidistant walls, a 86 plurality of solid iron partitions in metallic contact with said equidistant walls, means defining channels at both ends of said partitions, which channels extend transversely across said partitions, a current conductor comprising straight sections substantially parallel with said partitions and disposed therebetween in such manner that the current flows in inverse direction through the adacent parallel sections of said conductor, and insulating layers separating said conductor from' the, surrounding iron parts.

2. An electric heating device, comprising two equidistant cylindrical walls, peripheral ribsformed at the ends of said cylindrical walls, the

walls and the said ribs forming a completely closed box, a plurality of solid iron partitions in metallic contact with said cylindrical walls and disposed in such manner as to provide annular channels at each end thereof, the said channels extending transversely across said partitions, a current conductor comprising straight sections substantially parallel with said partitions and dispoud between said partitions in such manner that the current flows in inverse directions through the adjacent parallel sections of said conductor, and 110 extending transversely across said partitions, a current conductor comprising straight sections substantially parallel with said partitions and disposed therebetween in such manner that the current flows in inverse direction in the adjacent parallel section of said conductor, and insulating layers separating the said conductor from the surrounding iron parts.

PAUL HALAsz. 

